Ted MacNEIL wrote:
z900 and later processors have a separate caches for instruction fetch and data
fetch; usage DOES have a significant effect on performance
9672's and later.
I remember SAS having issues with this long before z.
There may have been some minor issues with SAS on 9672s. But, the real
problem that garnered so much attention occurred when attempting to run
SAS-generated, non-reentrant code on z900 (Freeway) machines. And, SAS
were not the only ones with performance issues. (We had some of our own.)
This issue taught the mainframe community a valuable lesson regarding
non-reentrant code and processor cache! Google for "SAS z900" (without
the surrounding quotes). This PDF from Cheryl Watson is representative
of what you'll find:
http://www.watsonwalker.com/PR010302.PDF
--
Edward E Jaffe
Phoenix Software International, Inc
5200 W Century Blvd, Suite 800
Los Angeles, CA 90045
310-338-0400 x318
[EMAIL PROTECTED]
http://www.phoenixsoftware.com/
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